Red azo dye



kilo. ol sodiumcarbonate.

the formation of the dycstull is complete.

UNITED STATES PATENT OFFICE.

(IA BL OSCAR MU LLER AND ALEXANDER OTTO, OF HOCHST QN-THE-MAIE, GERMANY, ASSIGN- Ulth 'lU l ARBWERKE VOBM: MEISJER 'LUCIUS & BRUNING, OF HOCHST-ON-THE-MAIN,- HEREJAN Y, A CORPORATION OF GERMANY.

' RED AZO DYE Specification 0! Letters Patent. i

Patented m 26, 1908.

Application filed April 23, 1907. Serial No. 369,852. (Specimena) italii whom it may concern:

Be it known thatwc, CARL OSCAR M ULLER, lh. 1)., and ALEXANDER- Orro, P11. 1)., chemists, citizens of the Empire of Germany, and residing at l liichst-on-the-iliain, Germany; have invented certain improvements in Making lied Azo Dyestuffs, of which the following is a specification.

We have l'ound that valuable substantive disazo dyestulls may be obtained, if the dyestulls having the general formula: diazo coinpound para-aminobenzoyl-2.5.7 aminonaphtholsulfonio acid be further diozotized and combined with one molecular proportion of 2.5.7-aminonelphtholsulfonic acid, wherein one hydrogen atom of the amido group may be replaced by an acidylrcsidue. As acidyl rest is to bcconsidcred, for instance, the

formyl grou the acetyl group or carbamic acid and tielike. As diam-compounds may be used those of primary bases, their sull'oand carboxylic acids. The )rocess may be carried out, for instance, fol ows Example I: The dycstuil' from 9.3 kil. of anilin and 38 kil. of ara-aminobcnzoyl2.5.7- uminonaphthol sul 'ouic acid is stirred into a thin paste, 8 kil. of nitrite being dissolved therein. 35 kil. of hydrochloric acid of per cent. strength are then allowed to run in so that the temperature. is maintained 'at 18-20 C. The whole is well stirred for 1 'l'iour and the diazo compound thus formed is ullowed to run into a solution of 30 hi]. ol' 2.5.7-aiinnonnphtliolsull'onic acid and After 27 hours it is salted out, filtered, rcsscd and cried.

'lhe dycstuil' is a grcenisi powder, readily.

soluble in hot water with a red color, dyeing cotton i'cd shades.

l'lxzuuple .l'l: The process is the some as in example .i while. substituting for the amidoimphthol sulionic acid. 2.5.7" serving as linul component, hiL- of its derivative l'oi'iuylated in the amide group.

Example ill: 24 lid. of lrcc 2.5.7-znmnonaphtho sull'omc acid are stirred 1D 25D kil.

of water, 20 kil. of potassium cyonatc being added. The whole is slowly heated to so that solution scts in after some hours. is then cooled to 20 0., Skil. of glacial acetic acid bei'n added. After 27 hours no free 8.11]lIlOIlitPibllOlSlllfUIllC acid can be traced and the urea (3,,ll,.OH(5)SO,Na(7)NH.CO.NH,,(2) is complete. There are then added 35 kil. of sodium carbonate to which is allowed to run the diezo compound of the dyest'ufl obtained from 10 kil. of brtho-toluidin and 38 kil. of para-aminobenzoyl-2.5 .7 -aminonaphthol sul'- tonic acid. After 24 hours the formation of the dyestufl is complete. It is salted out, filtered, pressed and dried. For toluidin, anilin and xylidi'n may be substituted of which the former yields somewhat yellower, the latter somewhat 'bluer red'shades than those obtained by the dyestuif from toluidin.

This holds good for the sulf0nicand carbox- I .ylic acids 0 said bases. I

Having described our invention, what we claim.is:- j

1. The herein described process of making disazo dyestuil's, which consists in further diazotizing the dyestuil's from a diazo compound and fparu-znninobcnZoyl-2.5.7-aminonaphtholsul onic acid and in combinin them with 2.5.7-aminonaphtholsulfonic acid wherein for one hydrogen atom of the free mnido group may be substituted an acidylresidue.

2. As new roducts, red dyestuffs having the formula. riazo com ound+ era-aminobenzoyl-2.5.7zuninona itholsuli formation of the unsymmetrical onic acid+ 2.5.7-amino1inphtholsuionic acid, wherein for one hydrogen atom of the free amino group may .be substituted on acidyl residue,

being in a solid state greenish powders, soluble in hot water and sulfuric acid with a red color, dyeing unniordanted cotton red tints.

in testimony, that we claim the ioregoing as our invention, we have signed. our names in presence of two subscribing witnesses.

nun OSCAR MULLER. v ALEXANDER OTTO.

Witnesses:

JEAN GRUND, CARL GRUNJ). 

